For the [$] price tag these were selling at, you are not going to find a better or faster bearing set. Just be cautious getting used to them if upgrading from a an ABEC 5 or lower, these are so fast they'll put you on your backside in a blink. The red color could be considered a pro or con depending on your tastes.

I bought these bearings for my the girls on my Roller Derby team. They needed some basic bearings at a low cost. This was a great deal on these bearings. We use them for indoor and outdoor rollerskating/derby training.